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Log in to the Nutanix Prism Element web console.
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Do one of the following:
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Select Expand Cluster in the Settings page. (or)
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Go to the Hardware dashboard and click the Expand Cluster button.
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Expand Cluster
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In the Expand Cluster window, select (click the radio button for) the desired option and then click the Next button:
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Select Expand Cluster to begin the expansion immediately (after you complete the remaining configuration steps).
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Expand Cluster - Success
Select Prepare Now and Expand Later to prepare the nodes now but delay adding them to the cluster until a later time. Preparing the nodes includes imaging the hypervisor (if needed), upgrading the AOS version (if needed), and preparing a new node network configuration (if needed). For more information on expanding the cluster, see https://portal.nutanix.com/page/documents/details?targetId=Web-Console-Guide-Prism-v6_7:wc-cluster-expand-wc-t.html.
Expanded Cluster
Ensure that factory-prepared node(s) are imaged with the same AOS/AHV version of the cluster. Re-imaging is not possible during expansion.
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In Nutanix Prism Settings, expand the cluster and check if the node(s) appear in the discovered list.
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Select the node(s) and add them to the cluster.
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Enter the details for the Host Name, Controller VM, Hypervisor, and IPMI IP.
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In the Encrypt Host, click "Generate and download CSR".
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Get the CSRs signed by a certificate authority (CA).
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Upload a signed certificate in order for the nodes to connect to the KMS server.
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Choose the Node type as "HCI Node".
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Choose the uplink for Host Networking.
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Click "Run Checks" to verify that the nodes are ready.
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Complete the cluster expansion.
Verify that the node is successfully added to the cluster and test the connectivity to the KMS servers.